"Nematocrystalline" chain packing: three-dimensional structure of low molecular weight linear polyethylene

Article Abstract:

The three-dimensional orthorhombic crystal structure of low molecular weight linear polyethylene PE600 (polydispersity: 1.11) is determined in space group Pnam from experimental electron diffraction intensities. It is found that in the most ordered form of this polymer, a superlattice exists for the extended chain packing with periodic clustering of nonunitary methylene group occupancies to account for the observed layer repeat

Plastics Material and Resin Manufacturing, Plastics materials and resins, Polyethylene, Observations, Crystals, Crystal structure, Electrons, Electron diffraction

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The bridged lamellar structure of synthetic waves determined by electron crystallographic analysis

Article Abstract:

Single-crystal structures of two synthetic waves have been solved in projection from electron diffraction data to demonstrate that the bridged lamellar model for low molecular weight linear polyethylenes is once more expressed. There are two archetypical structures for linear chain assemblies.

Waxes

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Crystal structure of wax lamellar interfaces-a residual petroleum fraction characterized by electron crystallography

Article Abstract:

A multicomponent paraffin assembly and its structure are studied by using electron crystallography. The result reveals that a model accounting for the actual chain length distribution was more accurate than the best Gaussian distribution of methylene occupancies.

Crystallography, Chemistry, Physical and theoretical, Physical chemistry, Structure, Paraffin wax

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